To determine the speed of the car:
Speed = Distance / Time
Speed = 150 miles / 5 hours = 30 miles per hour (mph)
Now, to find out how long it will take for the car to travel 750 miles at 30 mph:
Time = Distance / Speed
Time = 750 miles / 30 mph = 25 hours
So, it will take the car 25 hours to travel 750 miles at the same speed.